package com.qf.mapper;


import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.qf.pojo.TUser;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;

@Mapper
public interface UserMapper extends BaseMapper<TUser> {
        @Select("select id from t_user where usertname=#{username}")
        Integer selectOne(String username);
}
